Maybe helpful info to others What cams have you guys stuffed in stock shortblocks? I've used a KB and TA113...poston 113a...poston 116....and a TA413 Gonna try a 107/118 here soon
I've used the Poston 113 cam in a stock '71 shortblock and currently run one in my '70 GS 455 Conv. with a stock '70 shortblock. It's always been one of my favorites. Ken
My first aftermarket cam for my stock '67 430 was back in 1986 I think. Hydraulic Crower #52242: Engine Application 430 BUICK Grind Number 297-HDP Advertised Duration: 297º Lift: .539" Clearance Hot: .000 Advertised Duration: 308º Lift: .536" Clearance Hot: .000 Timing Events at .050" tappet lift: INTAKE Opens: 10.0º BTDC Closes: 46.0º ABDC EXHAUST Opens: 57.0º BBDC Closes: 5.0º ATDC LOBE SEPARATION 112º Duration at .050": Intake: 236º Exhaust: 242º LOBE LIFT Intake: .337" Exhaust: .335" No piston-to-valve issues, pistons were the usual 0.040" something in the hole like usual for BBB. Great low end and midrange, noticeable lope, good vacuum for brakes. Great w/my modded small dia variable pitch converter and butchered KB headers. Later swapped the cam into another stock 430 with manifolds, noticeably down on power/torque without headers. Graduated to notched forged pistons and a hotter custom solid cam a couple years after that. Later upped to 462 cid. Stayed w/solid lifter grinds and notched pistons ever since. Devon
Yea I'm gonna be CLOSE with the 107/118....using steel shims and had the deck cut a few tho....I'm pretty positive I'll be notching pistons
I had this in a stock 72 motor, advanced a crapload to make cyl pressure. Ran great, put the car inthe 12's
If I'm not mistaken and remember exhaust valve is what gets close....with 266° it's gonna be a squeeze....my other option is a 242/250 545 545 on a 110....gonna try both
One of the bigger thumper cams that would still run with factory rockers. I sold the engine,so all of the info went with it. That cam,B4B,headers,and a good Holley went 11:90’s in a 3900lb car. Nothing crazy.
The mutha thumpa actually has good looking specs for a stock shortblock imo..I was tempted to order but I got free options here...107lsa..mild lift and a good split for the manifolds...Howard's has a similar grind...I think they would actually perform pretty well based of the numbers not sure what lobes they are tho