• When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

340 mystery build - low vacuum

At what C/L is the cam installed? With enough intake P to V you could put it in at 100 ICL and try it. Your build mimicked a 360 I did long ago. .509" cam straight up, 8.6-1. From 4500 up it was just OK. Ran 13.50's in my Challenger with ported stock heads, 3.55, 4 speed, headers, LD 340, 650 Holley. Power brakes were useless. Same combo except swapped the cam to a [email protected] hyd roller, thin head gaskets raised comp to 9.0-1. Now it has been 12.70's with 3.55 in street trim. Runs on 86 octane.
Doug
 
Auto Transport Service
Back
Top