302 vs 351 build
#46
08-19-2014, 06:16 PM
Ummm. Only one type of factory roller lifters.
A few types of aftermarket roller lifters. Some have links between them, some have springs to lift them up when you loosen pushrods, some are direct retrofit for flat tappet and you don't need small base circle cam...
All you need to remember is this, roller cam requires steel or alloy distributor gear. Flat tappet requires a cast distributor gear.
A few types of aftermarket roller lifters. Some have links between them, some have springs to lift them up when you loosen pushrods, some are direct retrofit for flat tappet and you don't need small base circle cam...
All you need to remember is this, roller cam requires steel or alloy distributor gear. Flat tappet requires a cast distributor gear.
#47
08-19-2014, 06:45 PM
#49
08-19-2014, 09:19 PM
#50
08-19-2014, 09:25 PM
Never heard of this. Is it something that's happened to you or something you heard or read about? I've had a lot of these through the machine shop with zero issues.
#51
08-19-2014, 09:43 PM
#52
08-19-2014, 11:53 PM
Fleet Mechanic
Roller lifters and roller cam. Only the cobra 5liter had roller rockers stock.
If you are going to stick with a 302 then I would suggest just getting a complete explorer motor. It has most all of the good parts that you're looking for but you just need to upgrade the valve springs if you were going to put an aftermarket camshaft in it. If you are going to do a 351 then I would suggest getting a 94 to 96 where it already has the roller camshaft in it. Older than 94 it was a flat Tappet camshaft
If you are going to stick with a 302 then I would suggest just getting a complete explorer motor. It has most all of the good parts that you're looking for but you just need to upgrade the valve springs if you were going to put an aftermarket camshaft in it. If you are going to do a 351 then I would suggest getting a 94 to 96 where it already has the roller camshaft in it. Older than 94 it was a flat Tappet camshaft
#55
08-20-2014, 09:56 AM
Never seen a Ford small block head with 2.02 exhaust. Typically the biggest are 2.02 intake 1.6 exhaust. Older 351 heads have 1.84 intake 1.5 exhaust. Stock 302 and later 351 heads are 1.78 and 1.45. Even the gt40p use 1.84 and 1.45. Gt40 are 1.84 and 1.5.
#56
08-20-2014, 10:26 AM
Fleet Mechanic
That's exactly what I was saying but he actually wanted to argue with me over it. Like he was actually getting mad. He said his friend who did the machine work said it was some hot rodding trick to make Windsors run with Cleveland's back in the 70s but I thought he was full of it. I figured it had 2.02 intake and 1.60 exhaust but he's adamant that the 2.02 is the exhaust side. How does that even fit?
#58
08-20-2014, 03:33 PM
Fleet Mechanic
These are C9 302 (although now he says they are 351 heads) heads from what I have been told. He said these heads have extensive work done. The only thing I can think of is somehow the valve angles were changed to make room or something. I didn't think it would run right with a smaller intake valve. The machinist who's name escapes me now is apparently excellent at what he does. I have absolutely no idea how a 2.02 exhaust valve was stuffed in. He says the intake side is the 1.6.
#59
08-20-2014, 04:13 PM
I don't think 2.02 exhaust valves would clear the cylinder walls at the stock angle.
That would take a rework of the ports, machining out the heads, putting in new valve guides at an angle, a massive amount of work and I don't think it would perform worth a darn.
Someone may have done it, I just can't figure out why.
That would take a rework of the ports, machining out the heads, putting in new valve guides at an angle, a massive amount of work and I don't think it would perform worth a darn.
Someone may have done it, I just can't figure out why.
#60
08-20-2014, 05:20 PM
Fleet Mechanic
I don't think 2.02 exhaust valves would clear the cylinder walls at the stock angle.
That would take a rework of the ports, machining out the heads, putting in new valve guides at an angle, a massive amount of work and I don't think it would perform worth a darn.
Someone may have done it, I just can't figure out why.
That would take a rework of the ports, machining out the heads, putting in new valve guides at an angle, a massive amount of work and I don't think it would perform worth a darn.
Someone may have done it, I just can't figure out why.