Originally Posted by doorracer
Juice,
I tend to believe the intake has a huge influence over whether or not the 4-7 swap is successful or not, and the head flow to a lesser degree. Flow harmonics, a little over my head though. If you have a well thought out induction system 30hp is hard to come by.
Curtis
I hear what ya saying curt. I am not taking a position for or against that a 4-7 swap camshaft could make this kind of HP difference alone..I just don't Know...but what I do know like I said in my last post is a weak Built ( Bone stock type crate) engines have huge HP gains for minimal changes...so what I was trying to highlight is the difference in high Performance engines finding Hp VS. a Crate type engine...I think they said they used a crate engine in HP tv..
Now I will tell what I saw with my own Eyes...a carb and header switch,a minor angle mill on the heads bringing compression up 2 pts.. gained 83 hp on Dyno...this was on a GM CRATE engine used for Late Model round track racing.. (602 I think) they even had scored some of the extra tear off bolts to replace the parts......I watched this with my own Eyes at Clements racing in Spartanburg S.C. home of the LATE MODEL round track engine.
I have seen a 30 hp Gain also in Fuel Only ( Round track engines ) VP C-44 The Cost was $2500 per 55 gallon Drum 7 yrs ago !!!!! :roll:
Heres a little discussion off YB to where it mentions c-44 and few other fuels such as Q-16....Back when I owned my own race fuel Business C-44 was king of Circle track Fuel it retailed for $50.00 a gallon back then..
A huge help was the fuel is only 99 octane which the lower octane alone makes more HP on lower compression engines..Many in the past didn't or still don't know today.... they just started coming out with all the exotic oxygenated fuels back then...Now the market is Flooded with oxygenated fuels
by the way Curt How is your Son doing ?