Well said tpabayflyer.

My 318/349 runs a close to flat 13 in a 3600 lb car on road tyres with 3.9 gears , STOCK 360 heads, 10:1 comp and a [Email]231@.050[/Email] - .495 cam -

Thats just about identical to my buddies 360 with the same cam, and same weight car.

So with the 318 block already decked, align honed and magged - why would I start again with a 360?

It'll be a 4" arm for me next, an XS282S and heads ported to 250cfm - and Im chasing a flat 12........not bad for a "shrouded bore" boat anchor.

Bottom line - if you've got the $$ sunk into a prepped 318 - the 4" arm makes sense -

If its a 'start from scratch scenario - the cost of the 360 heads for the 390 balances out the extra cost of buyng a whole 360 long.

Last edited by Moparmal; 11/24/08 08:07 AM.
67 RO23 clone with 6.1 SRT Hemi and dual quads. Soon to have Drag Pak induction and Throttle body.