Pro Comp heads arrived today!
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Cargo Master
Joined: Apr 2003
Posts: 2,408
Likes: 5
From: Parkesburg PA
Pro Comp heads arrived today!
I'm still a bit cautious but for $550 to my door I have to try. I may regret it but I've seen too many mixed reviews not to try for myself. I plan on disassembling them and checking everything out next week. The casting and machine work so far looks great. The throat cut transition looks a little rough and there's some casting flash/marks in the ports but nothing too bad. All the as cast areas have a very smooth finish to them. They claim it's a permanent mold and I believe them.
My feeling is they had to have skimped on the valvetrain. It has undercut swirl polished stainless valves with 1.250 single springs with dampers. They're installed with 115lbs closed and good for .530 lift.
No threads are helicoiled but I may fix that, not sure. I'll probably do the accessories but not the studs. I intend to run a very small roller and the ad said they've been used with the E, B and F motorsports cams.
Specs are 190cc intake with 64cc heart shaped combustion chambers with 2.02/1.60 valves. Viton seals, chromoly retainers and take the Autolite 3924 plugs.
Ford 289 302 351W 408 427 5 0 Mustang Aluminum Heads GT40 EFI Carburetor | eBay
My feeling is they had to have skimped on the valvetrain. It has undercut swirl polished stainless valves with 1.250 single springs with dampers. They're installed with 115lbs closed and good for .530 lift.
No threads are helicoiled but I may fix that, not sure. I'll probably do the accessories but not the studs. I intend to run a very small roller and the ad said they've been used with the E, B and F motorsports cams.
Specs are 190cc intake with 64cc heart shaped combustion chambers with 2.02/1.60 valves. Viton seals, chromoly retainers and take the Autolite 3924 plugs.
Ford 289 302 351W 408 427 5 0 Mustang Aluminum Heads GT40 EFI Carburetor | eBay
FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
They certainly do look good. I do wish they would publish some flow #'s though. I know what my heads could do after porting them, so it would be interesting to see what those will do.
And, the 64 CC chambers are just about the right size, IMO. What deck height are you shooting for ?
And, the 64 CC chambers are just about the right size, IMO. What deck height are you shooting for ?
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Cargo Master
Joined: Apr 2003
Posts: 2,408
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From: Parkesburg PA
It's my understanding that their flow numbers out of the box are fair at best. What do you expect at 1/3rd the price. Since I plan on taking them apart to make sure everything looks ok I'm going to do a little cleanup porting. Nothing major but I understand they do respond well. Now, this ebay seller claims to to all the machining/assembly on these heads so they may be better than some china junk sold through jeggs. It's the combination of price and the fact that I'm building such a mild motor that got me. Price them 100 or 150 higher and I don't know that I would have tried them.
Deck height... I've been looking though my notes and can't find anything about it. I want to say .010 to .020. I'm just going to have to measure it and hope it's not too far down the hole. If they are maybe I'll get the block decked again. I know it's not zero decked. Did that before and it's a PITA but worth it. Piston's are KB hypereutectic -22cc dish. I'm hoping for around 9.25:1cr if they're .010 down. .020 down will get me closer to 9:1.
Deck height... I've been looking though my notes and can't find anything about it. I want to say .010 to .020. I'm just going to have to measure it and hope it's not too far down the hole. If they are maybe I'll get the block decked again. I know it's not zero decked. Did that before and it's a PITA but worth it. Piston's are KB hypereutectic -22cc dish. I'm hoping for around 9.25:1cr if they're .010 down. .020 down will get me closer to 9:1.
FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
Sounds good. Cleaning them up and blending should help. But with the 3-angle job done already it shouldn't take much.
And, with the quasi-open chamber design I'm not sure zero-decking will get you much as you don't have much area for quench. But 9:1 or 9.25:1 is pretty good, although what I've read says you can easily get by with more like 9.5 with the aluminum heads.
As for the pistons, those sound like the exact ones I have in the attic. Had plans for them that didn't materialize.
And, with the quasi-open chamber design I'm not sure zero-decking will get you much as you don't have much area for quench. But 9:1 or 9.25:1 is pretty good, although what I've read says you can easily get by with more like 9.5 with the aluminum heads.
As for the pistons, those sound like the exact ones I have in the attic. Had plans for them that didn't materialize.
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Cargo Master
Joined: Apr 2003
Posts: 2,408
Likes: 5
From: Parkesburg PA
I also have a variety of head gaskets that I can use from .039 to .059 that are reasonable affordable and with that I can fine tune +/- .3cr IIRC from when I was first figuring this all out.
Yeah. I've seen a few horror stories about the procomp heads and some tales of 10 flat passes - all out of the box... Who do you believe? From what I can see I don't think there's going to be much to do but blend a little...
But with the 3-angle job done already it shouldn't take much.
FTE Legend
Joined: Jul 2010
Posts: 32,875
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From: Northeast, OK
I'll believe you when you tell us what you find. But, it sounds like quality control isn't their best asset, and a few heads have made it out w/o getting the full treatment.
From what I've read and been told quench happens below .040". So, if you zero-deck those pistons and use the .039" gasket you are there. And, if your pistons are the ones I have they sit .020" higher than stock pistons IIRC. That might put you close.
From what I've read and been told quench happens below .040". So, if you zero-deck those pistons and use the .039" gasket you are there. And, if your pistons are the ones I have they sit .020" higher than stock pistons IIRC. That might put you close.
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Elder User
Joined: Oct 2006
Posts: 705
Likes: 2
From: stinkin lincoln, maine
MM&FF built a 400hp JY 302 with those heads and one of their single planes and a 750....was in the upper rpms not suitable for a truck, but they did it....Google should bring it up pretty easily.
I'm trying to decide between these and GT40's myself for a future motor.
I'm trying to decide between these and GT40's myself for a future motor.
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Posting Guru
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From: Missouri
I was interested in those heads when I had some head work done last year. I looked into them and the reviews are mixed as you say. They also list them on auctions and I saw some go as low as $430 or so. I put half of that into my old heads.
I wonder how well a small cam would do with such large valves and ports.
I wonder how well a small cam would do with such large valves and ports.
Fleet Mechanic
Joined: Jul 2011
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I think a small cam would work just fine, given that the vacuum levels tend to stay high with low duration. If you used a stock replacement cam on up to a towing cam, I wouldn't worry a bit. The exhaust valve is also at a reasonable size so that you wouldn't lose low-end torque.
If I had to pick, I'd still go with a towing cam to take advantage of the higher flowing heads.
If I had to pick, I'd still go with a towing cam to take advantage of the higher flowing heads.
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