Cam and heads question
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Junior User
Joined: Dec 2006
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From: middle Georgia
Cam and heads question
I have a 302 I am building to go in my 94 F150. The 302 has flat top pistons and a crane HIT 280 cam with 228/228 lift and 468/468 duration at .050. The motor has few hours on it but has been sitting for a while so I am going to put a re ring kit in it to freshen her up. everything else is stock on the motor. OK my questions are:
1. Is this cam too much for the MAF set up on my truck. If so what cam would be a better choice, Im on a budget with this one so think summit brand or another El'Cheepo.
2. My stock motor has E7TE heads but need to be reworked. The heads on the new motor are D80E castings. I know the E7 will be the better choice here but remember Im on a budget. Will I notice much of a power loss with the D8 over the E7 heads?
The truck will be a go to work and come home, take off trash, go to town for milk bread and beer kind of truck. I dont need a power house but would like to be able to ger on around aomeone wheen I need too. I will not tow very often but I will tow sometimes, things like a small 4 wheeler trailer or a small boat or something so take that into consideration with the suggestions. Thanks in advance!
1. Is this cam too much for the MAF set up on my truck. If so what cam would be a better choice, Im on a budget with this one so think summit brand or another El'Cheepo.
2. My stock motor has E7TE heads but need to be reworked. The heads on the new motor are D80E castings. I know the E7 will be the better choice here but remember Im on a budget. Will I notice much of a power loss with the D8 over the E7 heads?
The truck will be a go to work and come home, take off trash, go to town for milk bread and beer kind of truck. I dont need a power house but would like to be able to ger on around aomeone wheen I need too. I will not tow very often but I will tow sometimes, things like a small 4 wheeler trailer or a small boat or something so take that into consideration with the suggestions. Thanks in advance!
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
I'd rebuild the 94 motor and sell the other. Your 94 has a far better street cam than the one in the other. You've got the specs reversed, lift is .468, duration is 280 advertised, 228* @.050. The roller in the 94 is a 256/266 advertised duration with a .422/.445 lift. How many miles on the 94? The D8 heads have the compression in the other down about a full point from 9 to 1 to 8-something to 1.
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Junior User
Joined: Dec 2006
Posts: 85
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From: middle Georgia
Damn youre right. I posted in a hurry. I said that I could buy another cam but I am on a budget so I am not going to rebuild my 94 motor that has 245000 miles on it. I dont have the money right now that is why I am building the other. Ohh my 94 motor is not a roller either its not the original short block....lomg story short the prev. owner took a short block and re ringed it and slaped it in at 200000 miles due to an oil pump failure. The motor needed to be taken to a machine shop and worked but the patched it so now I am going to build the one I have and stick it in. I know the D8 heads are large chamber but I am running flat tops so the compression isnt going to be as bad as with dish tops. 8 to 1 maybe.
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
Not all flat topped 302 pistons are the same though. The pin height varies from 1.585 to 1.619. The upper puts the piston top at zero deck, the 1.585 leaves it a good .020 down the hole at TDC.That's assuming you don't have the mid 70's tall deck block (these were 8.226 vs the rest with 8.206 decks) That .020 puts an extra 4.5 ccs where you don't want it(.040 with the 70's block, & add another 4.5 ccs to that). Check the piston deck clearance before deciding to use the D8's. If anything, you can always mill them .030 without having to bother with the intake fit.
Last edited by baddad457; Jan 14, 2008 at 07:48 PM.
Thread Starter
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Junior User
Joined: Dec 2006
Posts: 85
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From: middle Georgia
The casting date on the block is 75 so with my luck its a tall deck. I understand about the flat tops not being the same, wrist pin location, valve reliefs and manufacture are all factors that weigh heavy on compression ratios. All Im saying is that Im not running dish tops. I might just work my E7's and run them because it sounds like I will have to do some machining to get anything out of the D8's and then I will not be satified. I am just trying to do this cheap as possible but I should listen to what I preach huh, Ya dont want to skip on quality and doing it right when the motor is on the stand. Easyer to do it now than later. Thanks for talking some sence into me!
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