tyler72

Well, I mean, you might notice 2-5 HP on an engine dyno, but the valves still outflow the runners, so there really isn't any point for the bigger valves. On an engine such as a 302-311, the smaller valve should be just fine. I have them in my 347, and I would say they might be hurting the HP numbers just a little, but they will help the torque, and in a heavy *** car like mine, the torque numbers are just as, if not more, important than the HP. Overall I am happy with my engine, but mechanical secondaries would be better for the engine considering my stall converter and cam size.

mjr46

have you run that thing yet!!??? be nice to see what it can clock.......as for my 11 to 1 306 I plan to sell the 66 and 92 and get a mass air 5 spd gt vert and put the 11 to 1 306 in that .....gonna call it project use what I got layin around and go as fast as I can for cheap as possible!!!! hey what are the specs on your cam?????

94StinkinLincoln

the rpm heads are too small for a 331. they are perfect for a 302/306, but any more motor and you are holding back power, thats why i bought canfield 195's baby

88_LX

will the heads fit on an 85 GT? i just ordered my headers and h-pipe, i wouldnt mindchanging the heads while im there

94StinkinLincoln

was 85 the year that had flat tops, with no valve releifs?
if that is the case no. the stock pistions have to be notched as far as i know, b/c of the large intake valve, thats where the isky notching tool comes in.

mjr46

no^^^^86 was

nitrous_bob

thats more than fair for him, i got my edelbrocks for $750 shipped and they are o-ringed

tyler72

I have ran my car once. It was pretty cool, I ran a 9 flat (in the eighth) at 81 MPH. That sounds slow, but it is a second and a half better than with the 302 and also 20 MPH faster. However, I will be easily running in the low eights/ high sevens after I get the posi trac, the 3.55's, and the drag radials. I cannot floor it off the line right now because it will just spin one tire all the way down the track. I hope to get it in the low sevens, but that may require some go fast juice.

My cam specs are: Lift; Int: .555 Exh: .570, Advertised Duration; Int: 284 Exh: 291, Duration @ .050; Int: 238 Exh: 245, & 110 degrees of lobe separation. The thing sounds awesome. It is a Coast High Hydraulic Roller Retrofit cam. It allowed me to use late model roller lifters and retainer in an early model non roller block.