Why is my car a dog?

[90VertGT]

I have a rebuilt 306 with a B303 cam and 1970 351 heads with bigger valves. They have been pocket ported and exhaust ported and I was told they should yeild around a 9.5:1 compression with it's 58cc chambers and a regular .031 comrpessed head gasket on a flat top piston. The motor now has 200 miles on it and it is a dog. What should the timing be set at with this cam? The original stock motor had a lot more balls than this car. Any help would be appreciated.Thanks.

 

[iwashmycar]

Not sure on the timing, but maybe pull some plugs to see how shes doin'?

 

[bock]

What about the intake? tb? maf? exhaust? fuel press? inject? With those heads you need more air than the stock set-up will give you. And the stock headers and cat MOST go! If you still running the stock #19 inject, you need at lest a biggers fuel pump 190 or 255 lph. and crank your fuel press with an adjutable fuel pressure regulator...

 

[90VertGT]

I have the stock intake right now but I do have a Trick Flow Street Heat waiting to go on. The Magnaflow X and catback is going on today. The TB, MAF, and Inj are all stock. What injectors would you suggest I use? 24lb? Thanks for the replies!

 

[Js5ohLX]

Yeah, the stock maf is your first problem, then your intake. B cams work best with 1.7 rockers and I assume it's a manual right?

 

[ECU5.0]

if he goes with 1.7 rockers he might have piston/valve clearance especially with flat top pistons? are there valve reliefs cut in the pistons or no?

 

[Js5ohLX]

How much lift do 1.7 rockers add? I didn't think about that. How big are the valves? aren't 70 351 heads D0AE? Those would be 69cc right?