Cullen, Bugz and all:
This issue of clearance with roller rockers came up when we were rebuilding
my '67 289. I was talked into "roller-tipped rockers" as a viable solution
to the clearance problem, and they certainly fit under the LAT alloy valve
covers with no problem.
But I have never heard these discussed on this list. Please excuse my
ignorance, but can anyone run the pros and cons past me (an anyone else
that's interested!) of these rocker arms, or is the only "pro" the fact that
they fit?? They certainly work well enough so far. (About 10,000 miles...)
Thanks guys,
Dave
----- Original Message -----
From: "Rense, Mark (GE Indust, ConsInd)" <mark.rense@ge.com>
To: "Nathan Johnson" <vesselofgrace@hotmail.com>; <tigers@autox.team.net>
Sent: Wednesday, November 04, 2009 10:57 AM
Subject: Re: [Tigers] Aluminum heads recommendations
> Nathan,
> I have built three SBF engines (347 stroker, 289, 331 stroker) using the
> Edelbrock aluminum Performer RPM heads and have had good luck with the
> quality and the horsepower. Now all three were flat tappet engines, so I
> cannot speak to the roller cam viability. The last engine was a 331
> stroker for a friend's FFA Cobra made from a '67 302, the idea was to
> build a reliable mid-power (350 hp) street engine that could be fun at
> track days. With headers, KB 9.7-1 pistons, Performer RPM intake
> manifold (very similar design to our F4B), Comp Cams Xtreme Energy
> XE268H cam, and a Holley 670 CFM carb the fool thing made 375 HP at 6200
> RPM at the rear wheel on Sunoco premium gas and still was very enjoyable
> as a street engine.
>
> For my Tiger I was interested in a reliable engine that had a little
> sack when I pushed the loud pedal. I built a 5-bolt 289 using the
> Edelbrock aluminum Performer Plus heads, Comp Cams XE262H cam, and KB
> .030-over 9.5:1 hypereutectic pistons. With stock cast iron headers, F4B
> intake, 500 CFM carb, dual-point distributor (with Pertronix), and 1.75"
> exhaust it still makes over 250 at the rear wheels at a reasonable 5200
> rpm. I wanted a long-lasting, torquey engine that was manageable and was
> period correct. So far, with a little over 12K miles on the engine, my
> expectations have been met, and yes, I can get the cast rocker covers
> off without dropping the engine. Plus, if I want more go, I can add
> headers, larger exhaust and bigger carb which will net another 50 HP or
> so.
>
> Hope this helps.
>
> Bugz
>
>
> -----Original Message-----
> From: tigers-bounces@autox.team.net
> [mailto:tigers-bounces@autox.team.net] On Behalf Of Nathan Johnson
> Sent: Tuesday, November 03, 2009 10:20 PM
> To: tigers@autox.team.net
> Subject: [Tigers] Aluminum heads recommendations
>
> I am just about to replace the 289 hipo in my Tiger and was looking for
> input on what heads to put on a 302 block. I figure I should go with
> roller rockers and cam for easy horsepower and efficency and it seems to
> be the general consensus that aluminum heads are worth the price to take
> weight off the front end and add more power. My first concern is which
> heads are compatible with the stock exhaust manifolds and my F4 intake?
> Second, I am not trying to make my kitty into a drag strip lion (still
> needs to be safe for the lead foot wife to drive...), so what are some
> reasonable priced heads to make 250-300 HP without going to headers? In
> response to my last post about valve cover modifications, I was told
> that using proform roller rockers should allow enough clearance to get
> my valve covers off without removing the engine mounts. Has anyone
> found other roller rockers that will also allow this kind of clearance?
> Thanks for the help.
>
> Nathan
> 66' Mark 1A
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