Im thinking about doing 1.7 rr on my stock cam, instead of putting in an e303 and 1.6's. my question is would that be a better/easier idea than putting in the new cam and replacing springs? (Id be getting new springs with 1.7's anyways) and would that cause me to be smog illegal by any chance? (in cali)
the lope would sound different as well correct? sorry for the questions Im just not very educated when it comes to this subject.
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'89 gt 5 speed- full exhaust with w/ pro dumps, 3.73's, u/d pullies
ah ok I was wondering about that option as well. Im looking at a set of gt40p's with a trickflow spring kit already on it. would I be able to run the 1.72's on maybe stock heads with new springs with no problems until I get new heads? and would the gt40p's fit my stock engine? it says they are 1.9 intake and 1.6 exhaust. idk much about heads....
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'89 gt 5 speed- full exhaust with w/ pro dumps, 3.73's, u/d pullies
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I would wait and just do heads and a cam at the same time. Putting 1.7s on your stock engine is going to be a waste of time and money for the gains you'll see, and the cam will probably sound the same since the duration doesn't change.
I would wait and just do heads and a cam at the same time. Putting 1.7s on your stock engine is going to be a waste of time and money for the gains you'll see, and the cam will probably sound the same since the duration doesn't change.
Im looking at a pair of gt40p's that says valves are 1.9 intake and 1.6 exhaust(not very knowledgable in heads), the cam that would be going with it is an e303. will I have to make any modifications for this combo? and should I just run 1.6 rr?
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'89 gt 5 speed- full exhaust with w/ pro dumps, 3.73's, u/d pullies
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GT40P heads with an E cam and 1.6s should work just fine on a stock bottom end as long as it's not an 86. You should always check piston to valve clearance but if you don't feel like it you should have no problems.
GT40P heads with an E cam and 1.6s should work just fine on a stock bottom end as long as it's not an 86. You should always check piston to valve clearance but if you don't feel like it you should have no problems.
Yeah I think I'm going to try to purchase the heads (hopefully =X) in the next couple days. Would I need the 3/8's, or 7/16's stud for the 1.6 rollers?
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'89 gt 5 speed- full exhaust with w/ pro dumps, 3.73's, u/d pullies
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quote:
ORIGINAL: 89cobra5.0
quote:
ORIGINAL: OnyxCobra
GT40P heads with an E cam and 1.6s should work just fine on a stock bottom end as long as it's not an 86. You should always check piston to valve clearance but if you don't feel like it you should have no problems.
Yeah I think I'm going to try to purchase the heads (hopefully =X) in the next couple days. Would I need the 3/8's, or 7/16's stud for the 1.6 rollers?
what he means is that gt40 heads require pedestal mounted rockers, not stud. its just a differnt type of attachment to the head, rockers are made either stud or pedestal.
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CAI, 75mm MAF, 70mm TB, 3.73''s, Long Tubes, O/R X Pipe, Straight Pipes, B&M Short Throw Shifter, 15* Timing. Waiting to install: GT40 intake + Cobra 1.7rr.
Posts: 6960
Joined: 11/27/2005 From: Chicago - in Rochester, NY Status: online
quote:
ORIGINAL: 89cobra5.0
quote:
ORIGINAL: OnyxCobra
I believe those heads are pedesetal mount.
.. can you explain a little bit? Im sorry its just a little over my head as far as tech talk wise...
Pedestal mount refers to how the rockers attach to the head. All stock heads run pedestal mount style, that is a bolt goes through the top of the rocker down into the head. Many aftermarket heads are stud mount which is a bolt sticking up out of the head that the rocker goes onto and is then held in place by a nut.
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1.7's, stock cam? - 
.. can you explain a little bit? Im sorry its just a little over my head as far as tech talk wise... 
