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#1
02-25-2014, 08:01 AM
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Howards retro fit 4 7 swap HR cams
Anyone run hr howards cams they have decent selection...
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#2
02-25-2014, 08:54 AM
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Thanks for shining a light on these. Saw one I'd like to try. Less lsa than sd performance ones leads to peakier hp/torque curves and rougher idle but the 4/7 swap is supposed to help smooth out idle and crank stress along with making more power. Nice to have options and easy click buy now on the Summit web site.
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#3
02-25-2014, 08:57 AM
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I would also like to hear about any combos/comments out there with these camshafts.
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#4
02-27-2014, 02:01 PM
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If you are running a dual plane intake do NOT use a 4/7 swap cam. A total waste of money and may actually hurt your performance by doing exactly the opposite of what it was supposed to do for a single plane manifold..
__________________
1994 Formula 535ci NA CV-1 - single 1050 with c14 - 940hp@7000/825tq@5200 Pontiac Powered 4th Gen Project Progress 
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#5
03-01-2014, 05:28 AM
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Quote:
What about new gm ls firing order? I have a Performer RPM and I'm interested in running the latest firing order as opposed to just a 4/7 swap. |
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#6
03-01-2014, 11:40 AM
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I recently designed a HR for a low compression (8.3:1) 400. R/A manifolds, regular Performer intake, Q-jet, 4spd tranny. It was a 4/7 swap, small duration and rather large LSA.
It put 314hp to the wheels, and a broad power band.
__________________
'73 T/A (clone). Low budget stock headed 8.3:1 455, 222/242 116lsa .443/.435 cam. FAST Sportsman EFI, 315rwhp/385rwtq on 87 octane. 13.12 @103.2, 1.91 60'. '67 Firebird [sold], ; 11.27 @ 119.61, 7.167 @ 96.07, with UD 280/280 (108LSA/ 109 ICL)solid cam. [1.537, 7.233 @93.61, 11.46 @ 115.4 w/ old UD 288/296 108 hydraulic cam] Feb '05 HPP, home-ported "16" D-ports, dished pistons (pump gas only), 3.42 gears, 275/60 DR's, 750DP, T2, full exhaust My webpage http://lnlpd.com/home |
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